<li>
    <span>
        常识
    </span>
    <ul>
        <li>
            <span tag="qa/basic">
                基本概念
            </span>
        </li>
        <li>
            <span tag="qa/why">
                常识性疑问
            </span>
        </li>
        <li>
            <span tag="qa/blanching">
                焯水
            </span>
        </li>
    </ul>
</li>
<li>
    <span>
        菜谱
    </span>
    <ul>
        <li>
            <span tag="braised-pork-in-brown-sauce">
                红烧肉
            </span>
        </li>
    </ul>
</li>